IUB CHEM-C 118 - 11-7 chapter 22 (17 pages)

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11-7 chapter 22



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11-7 chapter 22

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Pages:
17
School:
Indiana University, Bloomington
Course:
Chem-C 118 - Principles of Chemistry and Biochemistry Ii
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Clicker Question What metal ion would have the electron configuration Kr 4d 8 in the 2 oxidation state 1 2 3 4 Pd2 Ru2 Cd2 Tc2 22 Coordination Chemistry 22 1 Properties of the Transition Elements 22 2 Iron and Steel The Use of Pyrometallurgy 22 3 Copper A Coinage Metal 22 4 Silver and Gold The Other Coinage Metals 22 5 Chromium 22 6 Coordinate Covalent Bonds 22 7 Crystal Field Theory Friday Friday October October 31 31 2014 2014 Read Read Section Section 22 1 22 1 for for Friday Friday Sections Sections 22 2 22 2 22 3 22 3 and and 22 4 22 4 Monday Monday End End of of Chapter Chapter 22 22 Problems Problems 8 8 14 14 16 16 18 18 20 20 21 21 22 22 26 26 28 28 30 30 32 32 34 34 36 36 38 38 40 40 42 42 44 44 46 46 48 48 50 50 52 52 54 54 56 56 58 58 60 60 62 62 63 63 65 65 67 67 73 73 75 75 77 77 78 78 79 79 83 83 85 85 91 91 Coordinate Covalent Bonds An ion where ligands are bound to a central metal is a complex ion Ni H2O 6 2 has 6 H2O bound to Ni2 Ni Cl 4 2 has 4 Cl bound to Ni2 Writing complex ions metal ligand formula ion charge Coordinate Covalent Bonds What is the correct formula for the following complex 1 Fe NH3 2 OH 2Cl2 2 2 Fe NH3 2 OH 2Cl2 23 Fe NH3 OH Cl 2 Coordinate Covalent Bonds Coordination compounds are often brightly colored Ni H2O 6 NO3 2 Ni NH3 6 Cl2 Ni NH3 6 Cl2 contains the complex ion Ni NH3 6 2 and 2 Clcounter ions to balance the charge Counter ions are not always needed cisplatin Pt NH3 2Cl2 Coordinate Covalent Bonds What is the oxidation state of iron in the following complex K3 Fe OH 6 1 2 3 4 Fe0 Fe Fe2 Fe3 Naming Coordination Complexes Naming coordination complexes Co NH3 3 OH 3 Ligands are named in alphabetical order Ligand number is indicated using di tri tetra penta hexa Metal name and oxidation state are written at the end Naming Complex Ions Complex Cations Fe H2O 2 NH3 4 Cl3 Cations are named first Metal name and oxidation state follow ligand names Number of counterions is not written Naming Complex Ions Complex Anions Cations are named first Metal name and oxidation state follow ligand names Number of counterions is not written For complex anions the metal ion s name ends in ate Naming Complex Ions Ni H2O 6 NO3 2 Ni NH3 6 Cl2 Co NH3 3 OH 3 Pt NH3 2Cl2 Fe H2O 2 NH3 4 Cl3 Complex anion naming K2 Cr NH3 2Cl4 Naming Complex Ions Name the following coordination compound Cr NH3 2 H2O 3 OH Cl2 1 chromium III diamminetriaquahydroxo chloride 2 diamminetriaquahydroxochromium III dichloride 3 diamminetriaquahydroxochromium III chloride Nomenclature Summary General Ligands are named in alphabetical order Ligand number is indicated using di tri tetra penta hexa Metal name and oxidation state are written at the end Complex ions Cations are named first Metal name and oxidation state follow ligand names Number of counterions is not written For complex anions the metal ion s name ends in ate Ligand Names Neutral Ligand Name NH3Ammine CO Carbonyl H2NCH2CH2NH2 Ethylenediamine en H2O Aqua Anionic Ligand Name Br Bromo Cl Chloro CN Cyano F Fluoro OH Hydroxo CO32 Carbonato C2O42 Oxalato ox SCN Thiocyanato NCS Isothiocyanato ide becomes o Common Ligands to Know Monodentate ligands H Cl H HH Water Ammonia Chloride ion 2 O O Carbonate ion H2N O O O NH2 O H C O Cyanide ion Carbon monoxide Hydroxide ion C C 2 O Oxalate ion ox N N H2C CH2 Ethylenediamine en Hexadentate ligand Bidentate ligands O C C N Ortho phenanthroline phen O H N O C CH2 4 O O CH2 C O N CH2 CH2 N CH2 C O O C CH2 O O Ethylenediaminetetraacetate ion EDTA Chelating Ligands Chelating ligands grab metal ions They are polydentate ligands donating 2 e pairs EDTA is hexadentate 6 coordinate covalent bonds form 2 N atoms blue spheres 4 O atoms red spheres EDTA encapsulates insoluble metal ions making them soluble M Clicker Question A coordination compound is one that a Is formed between alkali metals or alkaline earths and halogens b Is formed from a transition metal ligands and enough counter ions to produce a neutral compound c Aids in balance and is found at enhanced levels in elite gymnasts and dancers d Results from a neutralization reaction e Is formed when elements of the third period react with halogens Coordination Number Coordination number number of coordinate covalent bonds between a metal ion and its ligands Coordination Number 2 K AuCl2 Examples 4 K2 NiCl4 Pt NH3 4 One bond6 ligands Co NH3 6 Cl3 Ag NH3 2 2 Fe H2O 6 2 monodentate CN 1 Two bond ligands bidentate CN 2 Denticity of a ligand Co en 3 3


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